An armed attack on a courthouse in Iran’s restive southeastern Sistan-Baluchestan province killed at least five people and injured 13, Iranian media reported.

Three assailants were also killed in the ensuing clashes with security forces, a senior police official told the state news agency IRNA.

He said a mother and child were among those killed by the gunmen who threw a hand grenade into the building in Zahedan, the capital of Sistan-Baluchestan.

The Baluch human rights group HAALVSH, quoting eyewitnesses, said several judiciary staff members and security personnel were killed or wounded when the assailants stormed the judges’ chambers.

Sistan-Baluchestan province frequently sees clashes between security forces and armed groups, including separatists who say they are fighting for greater rights and autonomy.